Delay Unit for Surround Sound - The Mitsubishi M65830 Delay IC has been discontinued (for reasons beyond my comprehension) , and so far a suitable replacement device has not been found. This means (of course) that you will be unable to build this delay circuit. I have left the project in place as reference, and the overall connection schematic is still valid if (when?) a replacement for the M65830 is located. The project will be updated at that time. In the meantime, just ignore the delay circuit __ Designed by Rod Elliott ESP
Delayed Audible Alarm - In this circuit, three multivibrator-type oscillators and a ripple counter are configured to produce an interesting, alarming sound, using two inexpensive integrated circuits plus a few other components. Operation is as follows:U1A and U1B and their associated components are configured as multivibrators, each of a selected audio frequency __ Designed by Arthur Harrison
Digital Delay Unit for Surround Sound - The Mitsubishi M65830 Delay IC has been discontinued (for reasons beyond my comprehension) , and so far a suitable replacement device has not been found. This means (of course) that you will be unable to build this delay circuit. I have left the project in place as reference, and the overall connection schematic is still valid if (when?) a replacement for the M65830 is located. The project will be updated at that time. In the meantime, just ignore the delay circuit __ Designed by Rod Elliott ESP
Digital volume control - The Tiny Audio Amplifier kit is a good choice for battery operation. It is based on LM386 IC.
Digital Volume Control - The heart of this digital volume controller DVC circuit is IC2 4067, 16-channel analog multiplexer. Because the 1kΩ has been connected between every input and output, the multiplexer can act like a potentiometer. The total resistance is 15kΩ. You can use different values for the resistor to obtain a different characteristic. __ Designed by Popescu Marian
Digital volume control - Circuit of a digital volume control using six discrete ICs, including a 5V regulator, is presented. IC1 (555) is configured to function as astable flip-flop. Its frequency or period may be adjusted by proper choice of resistors R44, R45 and capacitor C6 combination. Here it is for 0.3 second period __ Contact: IQ Technologies
Digital Volume Control - This circuit could be used for replacing your manual volume control in a stereo amplifier. In this circuit, push-to-on switch S1 controls the forward (volume increase) operation of both channels while a similar switch S2 controls __ Contact: IQ Technologies
Digital volume control has log taper - 04/11/02 EDN-Design Ideas Digital potentiometers provide a compact and convenient way to attenuate audio-amplifier signals. However, most such potentiometers suffer from at least one flaw a nonlogarithmic step increment. To avoid this problem, a user must usually step the potentiometer in a nonlinear sequence to simulate a logarithmic taper__ Circuit Design by Doug Farrar, Los Altos, CA
Digital Volume Control using DS1669 Digital Pot IC - This digital volume control has no pot to wear out and introduces almost no noise in the circuit. Instead, the volume is controlled by pressing UP and DOWN buttons. This simple circuit would be a great touch to any home audio project. __ Designed by Aaron Cake
Digital Volume Control with DS1669 - This is digital volume control circuit which uses DS1669 as the main volume control. This is stereo volume control, you can use stereo push button switch for to control both channel by together.
Easy Parametric & Graphic Eq's Plus Peaks & Notches - If you're into playing with tone controls and notch filters to see how they change the sound out of your effects, you will undoubtedly have built several glops of R's, C's and pots, maybe some L's to make up the tone networks. While this is fun, it's not very flexible. Sooner or later you might wonder if there is a more general solution to messing with tone controls. __ Designed by © 1999 R.G. Keen
Expandable Graphic Equaliser - Constant Q design. Can be made using as many or as few sections as needed __ Designed by Rod Elliott ESP
FM RDS Tuner Module - Stereo FM band receiver with RDS decoding for mobile applications.
Continuous full RDS data output through RS232: RDS PS, PI, TA/TP/TMC, CT, TMC. Full Radio Text supported: 2x64 characters. Raw TMC data output. __ Designed by Michel Bavin
FM RDS/RBDS + AM tuner Module - High quality integrated tuner module for worldwide FM, RDS/RBDS and AM reception. Receives full FM, LW, MW, and SW bands. __ Designed by Michel Bavin
Generating Tone using Pdo - Toshiba 870X Series Application Note
Guitar Control - Stand-alone, 9V battery powered unit; Three-level input selector, three-band tone control __ Contact: Flavio Dellepiane, fladello @ tin.it
HF/6m Tuner Preselector - Ham RadioBALUN, TUNERSSchematic __ Designed by Guy Roels ON6MU
HF/VHF mini portable tuner - If you elect to use an antenna tuner, it is extremely important that you understand exactly how to use tuners and what they can and cannot do. A few watts of RF can easily become lost in an incorrectly adjusted antenna matching device. The whole idea of a QRP station is to keep things simple and economical, so I cannot overemphasize the priority of a clean, efficient connection of the amplifier output to a resonant antenna. __ Designed by Guy Roels ON6MU
HF/VHF portable antenna tuner - Ham RadioBALUN, TUNERSSchematic __ Designed by Guy Roels ON6MU
High-Quality DAB+/FM Tuner, Pt.1 - We know you've been waiting for it and after more than a year in development, we are delighted to present this world-first high performance DAB+/FM stereo tuner design. It has all the bells and whistles of DAB+ in a sleek pro-quality case, with all features accessible by remote control. __ SiliconChip
High-Quality DAB+/FM Tuner, Pt.2 Last month, we introduced our new DAB+/FM Stereo Tuner and gave the circuit details. This month, we show you how to assemble the two PC boards and install them into a low-profile steel case. __ SiliconChip
High-Quality DAB+/FM Tuner, Pt.3 - In this month's final part, we explain how to use the DAB+/FM Stereo Tuner and describe the menu system. We also show you how you can upgrade the firmware if necessary and describe various features of the tuner in detail. __ SiliconChip
Homemade RF choke - Ham RadioBALUN, TUNERSSchematic __ Designed by Guy Roels ON6MU